1,There is on-----book on the desk Athe B a C an D╱答案D,为什么不加

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1,There is on-----book on the desk Athe B a C an D╱答案D,为什么不加a和the可数名词不可以单放在那要么加a要么the对吗?

英文是不可能用中文把语法学明白的!学中文语法难道用英文学能学明白吗?学英文语法,真要学明白,要用英文学!只有英文达到了能学明白英文语法的水平,才能学明白英文语法.这个道理跟中文一样,只有中文达到了能用中文学明白中文语法的水平,才能学明白中文语法.这个问题用英文解释很容易.
no=a determiner
a=a determiner
Two determiners,here,don't go together.
Good luck.

1,There is on-----book on the desk Athe B a C an D╱答案D,为什么不加 There is no[ ] book on the desk A the B a C an D / whose is ＿pen on my desk?A.a B.an C .the D.不填 There is ()uesful book on the shelf.A.the B.an C.a D./ Here ____pencils and a book on the desk.a.is b.are c.am d.be look!() eraser is on the desk,whose is it?A .A B.An C .The D There is a computer _______ the desk.A.on B.in C.under D.for There ___books on the desk.A isn't B is C aren't D have is there a book on the desk? __book on the desk is __useful one A .The;an B.A;a C.The;a D There __ a book and two pens on the desk.答案是is.为什么 There is a bed （）the left of the desk .A.in.B.at.C.on.D.wit